How to find all the local maxima (or peaks) in a numeric series?

Below is an example:

import numpy as np

from scipy.signal import argrelextrema

a = np.array([1,2,3,4,5,4,3,2,1,2,3,2,1,2,3,4,5,6,5,4,3,2,1])

# determine the indices of the local maxima

maxInd = argrelextrema(a, np.greater)

# get the actual values using these indices

a[maxInd]

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